1/10 is less than 2/5
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1/10 + 2/5 = 1/10 + 4/10 = 5/10 = 1/2
1/10 + 1/2 = 6/10 or 3/5
1/2 = 5/10 so then 5/10 - 3/10 = 2/10 = 1/5
1/5 x 2/2 = 2/10 2/10 + 3/10 = 5/10 = 1/2
2 and 1 over 10 as a percent = 210% 2 1/10: = 11/10 = 1.1 * 100% = 110%